From: Lucjan Bryndza <lbryndza.oss@icloud.com>

The current implementation of timers does not work properly
even in basic functionality. A counter configured to report
an interrupt every 10ms reports the first interrupts after a
few seconds.  There are also no properly implemented count up and
count down modes. This commit fixes bugs with interrupt
reporting and implements the basic modes of the counter's
time-base block.
Add time base registers definitions

Signed-off-by: Lucjan Bryndza <lbryndza.oss@icloud.com>
---
 include/hw/timer/stm32f2xx_timer.h | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/include/hw/timer/stm32f2xx_timer.h b/include/hw/timer/stm32f2xx_timer.h
index 90f40f1746..8112878aa7 100644
--- a/include/hw/timer/stm32f2xx_timer.h
+++ b/include/hw/timer/stm32f2xx_timer.h
@@ -49,9 +49,15 @@
 #define TIM_DMAR     0x4C
 #define TIM_OR       0x50
 
-#define TIM_CR1_CEN   1
+#define TIM_CR1_CEN 0x0001
+#define TIM_CR1_DIR 0x0010
+#define TIM_CR1_CMS 0x0060
+#define TIM_CR1_OPM 0x0008
 
-#define TIM_EGR_UG 1
+#define TIM_SR1_UIF 0x0001
+
+#define TIM_EGR_UG 0x0001
+#define TIM_EGR_TG 0x0040
 
 #define TIM_CCER_CC2E   (1 << 4)
 #define TIM_CCMR1_OC2M2 (1 << 14)
@@ -61,6 +67,7 @@
 
 #define TIM_DIER_UIE  1
 
+
 #define TYPE_STM32F2XX_TIMER "stm32f2xx-timer"
 typedef struct STM32F2XXTimerState STM32F2XXTimerState;
 DECLARE_INSTANCE_CHECKER(STM32F2XXTimerState, STM32F2XXTIMER,
@@ -99,4 +106,9 @@ struct STM32F2XXTimerState {
     uint32_t tim_or;
 };
 
+enum {
+    TIMER_UP_COUNT     = 0,
+    TIMER_DOWN_COUNT   = 1
+};
+
 #endif /* HW_STM32F2XX_TIMER_H */
-- 
2.38.5